Greatest Common Factor of 12, 42, 20, 647

Greatest common factor or Greatest common divisor (GCD) can be calculated in two ways

• Greatest Common Factor of 12, 42, 20, 647 by common division method
• Greatest Common Factor of 12, 42, 20, 647 with matching the biggest common factor

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∴ GCF of numbers is 1 because of no common factors present between them.

Factors of 12

List of positive integer factors of 12 that divides 12 without a remainder.

1,2,3,4,6,12

Factors of 42

List of positive integer factors of 42 that divides 42 without a remainder.

1,2,3,6,7,14,21,42

Factors of 20

List of positive integer factors of 20 that divides 20 without a remainder.

1,2,4,5,10,20

Factors of 647

List of positive integer factors of 647 that divides 647 without a remainder.

1,647

Greatest Common Factor

We found the factors 12,42,20,647 . The biggest common factor number is the GCF number.
So the greatest common factor 12,42,20,647 is 1.

Here are some samples of GCF of two or more Numbers calculations.

• GCF of 39, 43, 75, 818
• GCF of 77, 96, 27, 840
• GCF of 29, 38, 49, 832
• GCF of 75, 69, 51, 120
• GCF of 75, 45, 59, 590

1. What is the GCF of 12, 42, 20, 647?

Answer: GCF of 12, 42, 20, 647 is 1.

2. How to Find the GCF of 12, 42, 20, 647

Answer: Greatest Common Factor(GCF) of 12, 42, 20, 647 = 1

Step 1: Divide all the numbers with common prime numbers having remainder zero.

Step 2: Then multiply all the prime factors GCF(12, 42, 20, 647) = 1.